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Servo-Controlled Floppy Disk SYSTEM for Optical and Magnetic Recording

Publishing Venue

IBM

Related People

Wang, SS: AUTHOR

Abstract

The present publication describes a floppy disk system wherein the disk is moved rather than the Read/Write (R/W) head. This configuration allows multiple R/W heads per actuator, or the reading of an optical/ capacitive track in a magnetic disk. In a conventional twosided recording scheme, two heads on a frame, as shown in Fig. 1, are required. This conventional arrangement has the following design and implementation problems: (1) No space for multi-sensors and multi-stablizers. (2) Two-sided recording will have a vibration and access time problem. (3) A large sized opening slot will have a disk fluttering problem. (4) Difficult to install multi-recording heads. (5) Difficult to install actuators or air jets for disk-head spacing or disk tracking control. (6) Requires high precision tracking patterns.

Country

United States

Language

English (United States)

This text was extracted from a PDF file.

This is the abbreviated version, containing approximately
53% of the total text.

Page 1 of 2

Servo-Controlled Floppy Disk SYSTEM for Optical and Magnetic Recording

The present publication describes a floppy disk system wherein
the disk is moved rather than the Read/Write (R/W) head. This
configuration allows multiple R/W heads per actuator, or the reading
of an optical/ capacitive track in a magnetic disk. In a conventional
twosided recording scheme, two heads on a frame, as shown in Fig. 1,
are required. This conventional arrangement has the following design
and implementation problems: (1) No space for multi-sensors and
multi-stablizers. (2) Two-sided recording will have a vibration and
access
time problem. (3) A large sized opening slot will have a disk

fluttering problem. (4) Difficult to install multi-recording
heads. (5) Difficult to install actuators or air jets for
disk-head spacing or disk tracking control. (6) Requires
high precision tracking patterns. In this publication, we propose a
new servo-controlled floppy disk system that will reduce all the
above-mentioned problems. FEATURES The proposed system has the
following features which are not available in conventional disk drive
systems. (1) Matrix sensors on a fixed plate. (2) Slot opening at the
opposite side from the recording
head to minimize disk-disturbance problems. (3) A
computer-controlled magnetic bearing to move the
light weight floppy disk in the radical direction or (from

track to track). (4) Use of multi-recording heads for fast
access time. (5) A disk tension control scheme. (6) Allows use of
imperfect or crude disk patterns. (7) Allows use of same disk driven
for magnetic
recording, optical recording, or magnetic recording of data

and optical recording for tracking. (8) Sensing disk tracking
position from the top and
bottom surfaces of the disk. SYSTEM DESCRIPTION Referring to
Fig. 2, a rotating motor 1 drives a light weight spindle 2 through a
flexible belt 3. An alternate approach is to use a flexible shaft.

The spindle keeps the disk 4 rotating in the r direction. A linear
motor 5 moves the spindle and disk in the X direction. A
computer-controlled magnetic bearing 6 and position sensors 7 control
the fine motion of the disk in the X direction. Unlike conventional
disk drive systems, the proposed system has an opening slot 8 with
its major opening at the opposite side from the recording head 9
which is mounted on a fixed plate 10. Using this approach, several
recording heads, aerodynamic stablizers, sensors, actuators, and air
jets can be mounted and distributed on the fixed plate. For example,
a one-mil-high pre-stabilizer 14 can be used in front of the head see
top view of Fig. 2. This has been found ver...